Impact of non-thermal particles on the spectral and structural properties of M87

Abstract

The recent 230 GHz observations of the Event Horizon Telescope (EHT) are able to image the innermost structure of the M87 and show a ring-like structure which is in agreement with thermal synchrotron emission generated in a torus surrounding a supermassive black hole. However, at lower frequencies M87 is characterised by a large-scale and edge-brightened jet with clear signatures of non-thermal emission. In order to bridge the gap between these scales and to provide a theoretical interpretation of these observations we perform general relativistic magnetohydrodynamic simulations of accretion on to black holes and jet launching. M87 has been the target for multiple observations across the entire electromagnetic spectrum. Among these VLBI observations provide unique details on the collimation profile of the jet down to several gravitational radii. In this work we aim to model the observed broad-band spectrum of M87 from the radio to the NIR regime and at the same time fit the jet structure as observed with Global mm-VLBI at 86 GHz. We use general relativistic magnetohydrodynamics and simulate the accretion of the magnetised plasma onto Kerr-black holes in 3D. The radiative signatures of these simulations are computed taking different electron distribution functions into account and a detailed parameter survey is performed in order to match the observations. The results of our simulations show that magnetically arrested disks around fast spinning black holes ($a_{\star }\ge 0.5$) together with a mixture of thermal and non-thermal particle distributions are able to model simultaneously the broad-band spectrum and the innermost jet structure of M87

23 pages, 15 figures, submitted to A&A

References in corpus (19)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
• Jet Launching Structure Resolved Near the Supermassive Black Hole in M87
• MOJAVE: XV. VLBA 15 GHz Total Intensity and Polarization Maps of 437 Parsec-Scale AGN Jets From 1996-2017
• Magnetic Reconnection and Hot Spot Formation in Black Hole Accretion Disks
• Kinematics of the jet in M87 on scales of 100 -- 1000 Schwarzschild radii
• 230 GHz VLBI observations of M87: event-horizon-scale structure at the enhanced very-high-energy $\gamma$-ray state in 2012
• Plasmoid formation in global GRMHD simulations and AGN flares
• Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
• Comparison of the ion-to-electron temperature ratio prescription: GRMHD simulations with electron thermodynamics
• Pilot KaVA monitoring on the M87 jet: confirming the inner jet structure and superluminal motions at sub-pc scales
• Magnetic Jets from Swirling Disks
• Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC
• Jets, disc-winds and oscillations in general relativistic, magnetically driven flows around black hole
• Detection of Superluminal Motion in the X-Ray Jet of M87
• Bremsstrahlung in GRMHD models of accreting black holes
• Non-linear evolutions of magnetised thick discs around black holes: dependence on the initial data
• Relativistic outflows from a GRMHD mean-field disk dynamo